Bar-graph indicator for ac signals

Posted on Oct 24, 2012

Indicator was designed for displaying the peak level of small ac signals from a variety of transducers including microphones, strain gauges and photodiodes. The circuit responds to input signals contained within the audio frequency spectrum, i.e., 30 Hz to 20 kHz, although a reduced response extends up to 40 kHz. Maximum sensitivity for the component values shown, with VR1 fully clockwise, is 30 mV peak-to-peak.

Bar-graph indicator for ac signals
Click here to download the full size of the above Circuit.

The indicator can be calibrated by setting VR1 when an appropriate input signal is applied.

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